Hi, recently I found libinstpatch in debian repository. How can I read a Instrument with this library? Please take a look at sourceforge.net/projects/ags. libinstpatch will be initialized in main function. The following functions are involved: gboolean ags_ipatch_open(AgsPlayable *playable, gchar *filename); gboolean ags_ipatch_sf2_reader_open(AgsPlayable *playable, gchar *filename); void ags_ipatch_sf2_reader_level_select(AgsPlayable *playable, guint nth_level, gchar *sublevel_name, GError **error); void ags_ipatch_sf2_reader_iter_start(AgsPlayable *playable); gboolean ags_ipatch_sf2_reader_iter_next(AgsPlayable *playable); void ags_ipatch_sf2_reader_info(AgsPlayable *playable, guint *channels, guint *frames, guint *loop_start, guint *loop_end, GError **error); short* ags_ipatch_sf2_reader_read(AgsPlayable *playable, guint channel, GError **error); then it will be translated to ags format AgsAudioSignal by: GList* ags_playable_read_audio_signal(AgsPlayable *playable, AgsDevout *devout, guint start_channel, guint channels_to_read);